This is another post derived from a presentation given at the 2011 Annual Summer Meeting of the Wilderness Medical Society. Tracy Cushing, MD, of the University of Colorado School of Medicine gave an excellent presentation on submersion injury—i.e., the dangers of becoming submerged under water. What follows is some of what we learned.

Historically there have been many terms and definitions, such as “drowning,” “near-drowning,” “dry drowning,” and others. Current experts favor the term “submersion injury” as any adverse effect from submersion in water. This commonly causes difficulty breathing, for many reasons. “Immersion syndrome” refers to the situation where there is a lethal heart rhythm during or after a cold-water exposure, usually attributed to stimulation of the vagus nerve, which slows the heart rate. “Shallow water blackout” refers to a person becoming unconscious after hyperventilating prior to attempting a lengthy period of breath-holding underwater.

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